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This article in AJ

  1. Vol. 103 No. 6, p. 1862-1869
     
    Received: May 16, 2011


    * Corresponding author(s): fernande@illinois.edu
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doi:10.2134/agronj2011.0149

No-Till and Strip-Till Soybean Production with Surface and Subsurface Phosphorus and Potassium Fertilization

  1. Bhupinder S. Farmaha,
  2. Fabián G. Fernández * and
  3. Emerson D. Nafziger
  1. Dep. of Crop Sciences, Univ. of Illinois at Urbana-Champaign, 1102 S. Goodwin Ave., Urbana, IL 61801

Abstract

Compared to no-till, strip-till can offer improved seedbed conditions and deep banding of fertilizer. The objective of this study was to quantify the effect of rate and placement of P and K in no-till and strip-till systems on soybean [Glycine max (L.) Merr.] seed yield. A 3-yr field experiment was conducted near Urbana, IL, on Flanagan silt loam (fine, smectitic, mesic Aquic Argiudolls) and Drummer silty clay loam (fine-silty, mixed, superactive, mesic Typic Endoaquolls) soils, with soybean planted following corn (Zea mays L.). Tillage/fertilizer placement was the main plot with no-till/broadcast (NTBC); no-till/deep band (NTDB); and strip-till/deep band (STDB); deep band placement was 15 cm beneath the planted row. Phosphorus–fertilizer rate (0, 12, 24, and 36 kg P ha−1 yr−1) was the subplot, and K-fertilizer rate (0, 42, 84, and 168 kg K ha−1 yr−1) was the sub-subplot. Soil water, soil and trifoliate P and K, and seed yield were measured. Overall, STDB produced 3.1 Mg seed ha−1, 10, and 7% more yield than NTBC and NTDB, respectively. Seed yield, number of pods plant−1, and trifoliate P concentration and accumulation increased with P fertilization uniformly across tillage/fertilizer placement indicating that fertilization cannot be reduced with deep band applications relative to broadcast applications without a reduction in seed yield, but deep banding increased subsurface soil test levels. Potassium fertilization decreased seed yield in both no-till systems but not in the STDB system. While P and K placement produced no differences, improved soybean yield and nutrient accumulation resulted from a tillage effect with STDB relative to the no-till systems.

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Copyright © 2011. Copyright © 2011 by the American Society of Agronomy, Inc.